Vance: US let at least 12 ships pass blockade after Iran deal The US military has allowed at least 12 ships to pass through its naval blockade of Iran's ports following the signing of a memorandum of understanding between Washington and Tehran, Vice President JD Vance said on Thursday. "On the blockade, Centcom has allowed north of a dozen ships to go through our naval blockade, and so we're also honouring our end of the early part of the agreement," Vance told journalists, referring to the US military command responsible for the Middle East.